S11AL is from an one-piece aluminum cnc machined the cassette. It is one of the lightest on the market cassette. As the ceramic coating is more durable cassette.
Super Light Weight One-Piece Alloy Design Fit Shimano or Sram 11 speed System Teeth: 11-23T, 11-25T, 11-28T, 12-25T, 12-28T Color: Silver Type: SeqLite full aluminum Material: One piece CNC achined Aluminum 7075 For: Shimano Ultegra Dura Ace Coating: Ceramic Silver color Weight: 120g = 0.25lbs (S11AL-1123) Made in Taiwan Warranty: One year Note: 1. Please do not force to change the gear at low pedaling speeding 2. The cassette could last as least 500 km to 3000 km depends the bike service 3. The most important service is to remove the sand after riding every time 4. Also clean the dirty oil on the chain & cassette then lubricate the chain and cassette 5. Change the cassette and chain at the same time